660654421 has 8 divisors (see below), whose sum is σ = 757448384. Its totient is φ = 564464160.

The previous prime is 660654409. The next prime is 660654427. The reversal of 660654421 is 124456066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660654421 - 2⁵ = 660654389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660654427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148575 + ... + 152956.

It is an arithmetic number, because the mean of its divisors is an integer number (94681048).

Almost surely, 2^660654421 is an apocalyptic number.

It is an amenable number.

660654421 is a deficient number, since it is larger than the sum of its proper divisors (96793963).

660654421 is a wasteful number, since it uses less digits than its factorization.

660654421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301851.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 660654421 is about 25703.1986530860. The cubic root of 660654421 is about 870.9464404132.

The spelling of 660654421 in words is "six hundred sixty million, six hundred fifty-four thousand, four hundred twenty-one".